Help! Shaking car!!

[mookie]

I've had my blingo for 2 weeks, for a week of that she has been in the garage.
Eva drives perfectly until you hit 40mph and then the whole car shakes, she shakes between 40mph and 50mph once you go over 50mph she settles and drives beautifully and it's the same under 40mph.

The garage have changed the tyres, wheels, balanced the wheels and now have no idea what's wrong.
I'm now waiting for her to be tried on a rolling road to see if the garage can figure out what the problem is.

Does anyone have any ideas? I just want my car back.

[3rensho]

My former father-in-law had a Morgan Plus 4 that did the same trick. Was perfect up to about 45 and then hold on Nelly. Was a suspension part but have forgotten which.

[evdama]

Front suspension bushes ?

[talos]

I had that on a metro, turned out to be the compensating weight on the drive shaft come loose, might be worth a look.

[mookie]

Thanks! Eva is on the rolling road tomorrow so I'll let you know what happens...